Light emitting device, its manufacturing method and its mounted substrate

Abstract

A light emitting device according to the invention includes: a package including a generally quadrangular light emitting surface with a recess formed therein, a rear surface opposed to the light emitting surface, a first side surface generally orthogonal to the light emitting surface and the rear surface, and a second side surface opposed to the first side surface; and a light emitting element provided in the recess. At least one of the first side surface and the rear surface include a first and second feeder electrode surfaces and a mounting surface provided between the first feeder electrode surface and the second feeder electrode surface. A step difference is provided between the first feeder electrode surface and the mounting surface, and a step difference is provided between the second feeder electrode surface and the mounting surface. The first and second feeder electrode surfaces are set back from the mounting surface adjacent thereto. This structure is possible to make a light emitting device high in brightness and thin in thickness.

1 . A light emitting device comprising:
 a package including a generally quadrangular light emitting surface with a recess formed therein, a rear surface opposed to the light emitting surface, a first side surface generally orthogonal to the light emitting surface and the rear surface, and a second side surface opposed to the first side surface; and   a light emitting element provided in the recess,   at least one of the first side surface and the rear surface including a first and second feeder electrode surfaces connected to the light emitting element and a mounting surface provided between the first feeder electrode surface and the second feeder electrode surface,   a step difference being provided between the first feeder electrode surface and the mounting surface,   a step difference being provided between the second feeder electrode surface and the mounting surface, and   the first and second feeder electrode surfaces being set back from the mounting surface adjacent thereto.   
   
   
       2 . The light emitting device according to  claim 1 , wherein
 the first and second feeder electrode surfaces and the mounting surface are provided on the first side surface, and   the first side surface further includes a protrusion provided at least one of both ends outside the first and second feeder electrode surfaces and a position dividing the first and second feeder electrode surfaces, the protrusion protruding to a plane generally coplanar with the mounting surface.   
   
   
       3 . The light emitting device according to  claim 1 , wherein
 the first and second feeder electrode surfaces and the mounting surface are provided on the first side surface,   the light emitting surface is provided with a first light emitting surface electrode connected to the first feeder electrode surface and a second light emitting surface electrode connected to the second feeder electrode surface, and   the rear surface is provided with a first rear surface electrode connected to the first feeder electrode surface and a second rear surface electrode connected to the second feeder electrode surface.   
   
   
       4 . The light emitting device according to any one of  claims 1  to  3 , wherein
 the first and second feeder electrode surfaces and the mounting surface are provided on the first side surface,   the second side surface includes a third feeder electrode surface provided at one end thereof and connected to the first feeder electrode surface, and a fourth feeder electrode surface provided at the other end thereof and connected to the second feeder electrode surface, and   at least one of the first to fourth feeder electrode surfaces is different in shape from the others.   
   
   
       5 . A manufacturing method for a light emitting device which includes a package including a light emitting surface with a recess formed therein and a first side surface being generally orthogonal to the light emitting surface and having a first and second feeder electrode surfaces, and a light emitting element provided in the recess, the manufacturing method comprising:
 forming the first and second feeder electrode surfaces by forming a conductive layer on an inner wall of a plurality of through holes formed in a base body which includes the recess in a plurality.   
   
   
       6 . A manufacturing method for a light emitting device, comprising:
 forming a conductive layer on an inner wall of a through hole in a base body which includes the recess and a through hole in a plurality;   mounting a light emitting element in the recess;   connecting a lead electrode provided in the recess to the light emitting element by a bonding wire;   filling the recess with a resin; and   cutting the base body along a line connecting the through holes.   
   
   
       7 . The manufacturing method for a light emitting device according to  claim 5 , wherein the height of a step difference formed between a cut surface exposed by the cutting and the conductive layer formed on the inner wall of the through hole is regulated by adjusting at least one of the position of the cutting and the thickness of a blade used for cutting. 
   
   
       8 . A mounted substrate comprising:
 a substrate;   a first and second land electrodes provided on the substrate; and   the light emitting device according to any one of  claims 1  to  4  provided on the substrate,   the first feeder electrode surface of the light emitting device being connected to the first land electrode, and   the second feeder electrode surface of the light emitting device being connected to the second land electrode.   
   
   
       9 . A light emitting device comprising:
 a package including a resin or ceramic with a recess formed therein; and   a light emitting element provided in the recess,   an outer wall surface of the resin or ceramic being provided with a reflecting film.   
   
   
       10 . A light emitting device comprising:
 a package made of a resin or ceramic and including a light emitting surface with a recess formed therein and a side surface adjacent to the light emitting surface; and   a light emitting element provided in the recess,   the side surface being provided with a reflecting film.   
   
   
       11 . The light emitting device according to  claim 10 , wherein the light emitting surface is also provided with a reflecting film. 
   
   
       12 . The light emitting device according to any one of  claims 9  to  11 , wherein the reflecting film is one selected from the group consisting of a metal film, a film containing metal oxide fine particles, and a multilayer film made of a dielectric.